I remixed the wemos case by rickvillela to incorporate a different relay as mine seems offset from the board so I had to add a bit of length. Mine is an aliexpress bought relay.

I added terminal protection and a cover for where you need to screw the terminals as I intend to use this to switch 240v.

Btw yes I know in the image of the relay and wemos the wemos isn't soldered to the headers, it's for demonstration of the offset board. I'm out of d1 minis at the moment so mocked it up with a pro. I'm not wasting a pro on a relay :)

Now I've actually soldered everything

UPDATE:

So I forgot the pro has no chips on the bottom of the board whereas the stamdard d1 mini has. I've added one for the pro and one for the standard.

A happy accident I didn't think about when putting this together is the on board LED glows blue when it's off.